Built-up crank shaft



F. W. PARSONS AND F. A. HMERSON.

BUILT-UP CRANK SHAFT. 'KPPLICATION FILE-D JUNE 1, 1922.,

v Patented Oct. 1M), 1922.

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THEIR sons, a citizen of the United States, a resibearings, and the nd'w b E d f L JE'JRJEDCK W. PARSONS, 01E ELMIJRA, NE YORK, AND FRANCIS Ml J'IMERSON, 01E ATHENS, PENNSYLVANIA, ASSIGNORS 1P0 INGERSOLL-RAND COANY, 0F JERS CITY, NEW JERSEY, ACORTORATIQN OF NEW JERSEY,

norm-er can snar'r.

Application filed June 1, i922. Serial no. 565,068.

To all whom it may concern: I

Be it known that We, FREDERICK W. PAR-\.

dent of Elmira,.county of Chemung, State of New York, and FRANCIS A. Jimnnson, a

citizen of the United States, a resident of Athens, county of Bradford, State of Pennsylvania have invented a certain Bu lt-Up (Jrank Shaft, of which the following is a specification accompanied by drawings.

The invention relates to built up crank shafts for fluid actuated multi-cylinder engines and the objects of the invention are to simplify and strengthen such crank shafts, obtain better balance and more perfect alignment of the bearings, and permit the use in the engine of solid end COIIIIGCD". ing rods, rather than multiple piece connecting rods or those of the toggle type. Another object of the invention 1s to enable the parts to be readily assembled and disassembled.

A further object of the invention is to provide passages and ducts for lubricating material in the several parts of the crank shaft, which\will permit oiling of the bearings, due to the flow of fluid under pressure carrying oil through the said passages and ducts.

To all of these ends the invention isshown in the accompanying drawings in one of its preferred forms, in which-'- Figure 1 is a longitudinal sectional elevation of the assembled crank shaft,

Figure 2 is a side elevation,

Figure 3 is a transverse sectional view on the line 3-3 of Figure 1, looking in the direction of the arrows, and I Figure 4 is a transverse sectional view on the line 4-4 of Figure, 1 looking in the direction'of the arrows.

Referring to the drawings, the crank shaft comprises a center web A having transverse apertures 13 at each 'end for the rece tion of the crank pins C. The shaft ends are provided with end webs E and F carrying the crank pins G, which in thisinstance are formed integral with the end webs. One shaft end D is also integral with the web F, but in this instance the other shaft end D 1s separate from the end web E and inserted in said web.

Pins H passing through the center web and crank pins locate and align the crank with apertures pins in position. i The shaft ends carry the mam bearings J, whlch are preferabl ball are the counter- .may also be pinion Ll preferablly provided with weights ()ne shaft end D provided with the driving he centerweb A tral slot 0, and a bolt P having screw threaded engagement with the portion Q, of the centerweb, is also provided with the nut R, so that the portions of the web body may be drawn together to tightly grip and-hold the crank pins C.

In accordance with this invention, the shaft ends D 'and the crank pin C are hollow and formed with the passages T and U for the passage of lubricating material, and the end webs E and F are'each provided with an interior oil passage V connecting the hollow bores or passages T and U, respectively, of the ad acent shaft ends and crank pins, so that there is a continuous passage through each crank pin and web and shaft end for the flow of fluid under pressure carrying lubr1cant, as the crank shaft rotates. walls of the crank pins are furthermore provided with radial apertures W registerin X in the bearing sleeves 1 Apertures Z are also pins. The apertures lubricant to lubricate and the apertures Z culation of the lubricant. In accordance with this construction, the fluid pressure in the crank case of an engine carries motive fluid together with lubricant through the passages-in the shaft ends, websand crank plgovided in the crank permit the flow of the crank pin bearin The is provided with a cenpermit additional 011'- pins of the crank shaft, and centrifugalaction carries the lubricant outwardly through the lateral apertures Win the crank pins, to the crank pinbearings.

We claim:

1'. Abuilt up crank shaft for multi-cylinder engines, comprising a center'web having transverse apertures at each end, shaft ends having end webs carrying crank pins in- 'tegral therewith and adapted to be inserted radial apertures, and locating means for .hblding and aligning the crank pins in position. 7

2. A- built up crank shaft for multi-cylinder engines, comprising a center webhaving transverse apertures at each end and a central'longitudinal slot'in the body portion of the web connecting said apertures, shaft ends having end webs carrying crank pins integral therewith and adapted to be inserted in the transverse apertures in the center web, said shaft ends and crank pins being hollow for the passage of lubricating material and the end webs each having an interior oil pas- 

